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Chapter 1: Q25 (page 11)

What鈥檚 Wrong? In Exercises 25鈥�28, identify what is wrong.

Potatoes In a poll sponsored by the Idaho Potato Commission, 1000 adults were asked to select their favorite vegetables, and the favorite choice was potatoes, which were selected by 26% of the respondents.

Short Answer

Expert verified

The Idaho Potato Commission conducted the survey, which resulted in 26% of the respondents favoring the vegetable potato.

Step by step solution

01

Given information

The number of adults surveyed for their favorite vegetable was 1000. The survey was sponsored by the organization Idaho Potato Commission.

Results of the survey: 26% chose potato as their favorite vegetable.

02

The sampling procedure 

The survey looks for the most favorite vegetable in the population. Among the 1000 selected sample adults, 26% opted for potato.

It is further known that a potato commission sponsored the survey.

03

Identifying the wrong element in the survey

The results are very likely to be biased in the survey.

The responses of 26% for potatoes are significantly high, but it seems to be biased as the poll was conducted in the sponsorship of an organization that deals in potatoes.

Thus, there are high chances that the results are biased in the study.

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Most popular questions from this chapter

In Exercises 29鈥�36, answer the given questions, which are related to percentages.

Chillax USA Today reported results from a Research Now for Keurig survey in which 1458 men and 1543 women were asked this: 鈥淚n a typical week, how often can you kick back and relax?鈥�

a. Among the women, 19% responded with 鈥渞arely, if ever.鈥� What is the exact value that is 19% of the number of women surveyed?

b. Could the result from part (a) be the actual number of women who responded with 鈥渞arely, if ever鈥�? Why or why not?

c. What is the actual number of women who responded with 鈥渞arely, if ever鈥�?

d. Among the men who responded, 219 responded with 鈥渞arely, if ever.鈥� What is the percentage of men who responded with 鈥渞arely, if ever.鈥�?

e. Consider the question that the subjects were asked. Is that question clear and unambiguous so that all respondents will interpret the question the same way? How might the survey be improved?

Determine whether the sampling method appears to be sound or is flawed.

Clinical Trials. Researchers at Yale University conduct a wide variety of clinical trials by using subjects who volunteer after reading advertisements soliciting paid volunteers.

Quantitative/categorical DataIdentify each of the following as quantitative data or categorical data.

a. The platelet counts in Data Set 1 鈥淏ody Data鈥� in Appendix B.

b. The cigarette brands in Data Set 13 鈥淐igarette Contents鈥� in Appendix B.

c. The colours of the M&M candies in Data Set 27 鈥淢&M Weights鈥� in Appendix B.

d. The weights of the M&M candies in Data Set 27 鈥淢&M Weights鈥� in Appendix B.

In Exercises 21鈥�24, refer to the data in the table below. The entries are white blood cell counts (1000 cells,ML) and red blood cell counts (million cells,ML) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

Context Given that the data are matched and considering the units of the data, does it make sense to use the difference between each white blood cell count and the corresponding red blood cell count? Why or why not?

Sampling In a statistical study, which of the following types of samples is generally best: convenience sample, voluntary response sample, simple random sample, biased sample?
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